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  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2002-03-21 16:57:43 UTC
  • Revision ID: james.westby@ubuntu.com-20020321165743-e9mv12c1tb1plztg
Tags: upstream-2.6
Import upstream version 2.6

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man/robust/des2ss.man
 
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.TH des2ss 1 "April 1993" "Scilab Group" "Scilab Function"
 
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.so ../sci.an
 
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.SH NAME
 
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des2ss - descriptor to state-space
 
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.SH CALLING SEQUENCE
 
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.nf
 
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[Sl]=des2ss(A,B,C,D,E [,tol])
 
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[Sl]=des2ss(Des)
 
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.fi
 
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.SH PARAMETERS
 
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.TP 16
 
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A,B,C,D,E
 
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: real matrices of appropriate dimensions
 
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.TP
 
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Des
 
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: list
 
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.TP
 
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Sl
 
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: \fVsyslin\fR list
 
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.TP
 
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tol
 
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: real parameter (threshold) (default value \fV100*%eps\fR).
 
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.SH DESCRIPTION
 
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Descriptor to state-space transform.
 
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.LP
 
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\fVSl=des2ss(A,B,C,D,E)\fR returns 
 
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a linear system \fVSl\fR equivalent to the descriptor system 
 
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\fV(E,A,B,C,D)\fR.
 
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.LP
 
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For index one \fV(E,A)\fR pencil, explicit formula is used and
 
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for higher index pencils \fVrowshuff\fR is used.
 
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.LP
 
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\fVSl=des2ss(Des)\fR with \fVDes=list('des',A,B,C,D,E)\fR returns
 
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a linear system \fVSl\fR in state-space form with possibly 
 
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a polynomial \fVD\fR matrix.
 
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.LP
 
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A generalized Leverrier algorithm is used.
 
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.SH EXAMPLE
 
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.nf
 
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s=poly(0,'s');G=[1/(s-1),s;1,2/s^3];
 
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S1=tf2des(G);S2=tf2des(G,"withD");
 
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W1=des2ss(S1);W2=des2ss(S2);
 
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clean(ss2tf(W1))
 
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clean(ss2tf(W2))
 
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.fi
 
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.SH SEE ALSO
 
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des2tf, glever, rowshuff
 
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